/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.appspot.eusms.recipients;

import android.content.Context;
import android.util.Log;

import com.appspot.eusms.contacts.ContactPhotoFactory;
import com.appspot.eusms.database.CanonicalAddressDatabase;
import com.appspot.eusms.util.NumberUtil;

import org.whispersystems.textsecure.push.IncomingPushMessage;
import org.whispersystems.textsecure.util.Util;

import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;

public class RecipientFactory {

    private static final RecipientProvider provider = new RecipientProvider();

    public static Recipients getRecipientsForIds(Context context, String recipientIds, boolean asynchronous) {
        if (Util.isEmpty(recipientIds))
            return new Recipients(new LinkedList<Recipient>());

        List<Recipient> results = new LinkedList<Recipient>();
        StringTokenizer tokenizer = new StringTokenizer(recipientIds.trim(), " ");

        while (tokenizer.hasMoreTokens()) {
            String recipientId = tokenizer.nextToken();
            Recipient recipient = getRecipientFromProviderId(context, recipientId, asynchronous);

            results.add(recipient);
        }

        return new Recipients(results);
    }

    private static Recipient getRecipientForNumber(Context context, String number, boolean asynchronous) {
        long recipientId = CanonicalAddressDatabase.getInstance(context).getCanonicalAddress(number);
        return provider.getRecipient(context, recipientId, asynchronous);
    }

    public static Recipients getRecipientsFromString(Context context, String rawText, boolean asynchronous)
            throws RecipientFormattingException {
        if (rawText == null) {
            throw new RecipientFormattingException("Null recipient string specified");
        }

        List<Recipient> results = new LinkedList<Recipient>();
        StringTokenizer tokenizer = new StringTokenizer(rawText, ",");

        while (tokenizer.hasMoreTokens()) {
            Recipient recipient = parseRecipient(context, tokenizer.nextToken(), asynchronous);
            if (recipient != null)
                results.add(recipient);
        }

        return new Recipients(results);
    }

    public static Recipients getRecipientsFromMessage(Context context,
                                                      IncomingPushMessage message,
                                                      boolean asynchronous) {
        try {
            return getRecipientsFromString(context, message.getSource(), asynchronous);
        } catch (RecipientFormattingException e) {
            Log.w("RecipientFactory", e);
            return new Recipients(Recipient.getUnknownRecipient(context));
        }
    }

    private static Recipient getRecipientFromProviderId(Context context, String recipientId, boolean asynchronous) {
        try {
            return provider.getRecipient(context, Long.parseLong(recipientId), asynchronous);
        } catch (NumberFormatException e) {
            Log.w("RecipientFactory", e);
            return Recipient.getUnknownRecipient(context);
        }
    }

    private static boolean hasBracketedNumber(String recipient) {
        int openBracketIndex = recipient.indexOf('<');

        return (openBracketIndex != -1) &&
                (recipient.indexOf('>', openBracketIndex) != -1);
    }

    private static String parseBracketedNumber(String recipient)
            throws RecipientFormattingException {
        int begin = recipient.indexOf('<');
        int end = recipient.indexOf('>', begin);
        String value = recipient.substring(begin + 1, end);

        if (NumberUtil.isValidSmsOrEmail(value))
            return value;
        else
            throw new RecipientFormattingException("Bracketed value: " + value + " is not valid.");
    }

    private static Recipient parseRecipient(Context context, String recipient, boolean asynchronous)
            throws RecipientFormattingException {
        recipient = recipient.trim();

        if (recipient.length() == 0)
            return null;

        if (hasBracketedNumber(recipient))
            return getRecipientForNumber(context, parseBracketedNumber(recipient), asynchronous);

        if (NumberUtil.isValidSmsOrEmailOrGroup(recipient))
            return getRecipientForNumber(context, recipient, asynchronous);

        throw new RecipientFormattingException("Recipient: " + recipient + " is badly formatted.");
    }

    public static void clearCache() {
        ContactPhotoFactory.clearCache();
        provider.clearCache();
    }

    public static void clearCache(Recipient recipient) {
        ContactPhotoFactory.clearCache(recipient);
        provider.clearCache(recipient);
    }

}
